Re: [-mm] Add an owner to the mm_struct (v2)

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Fri, 28 Mar 2008 13:53:16 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> -static struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
> +struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
>  {
>  	return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
>  				struct mem_cgroup, css);
> @@ -250,12 +250,17 @@ void mm_init_cgroup(struct mm_struct *mm
>  
>  	mem = mem_cgroup_from_task(p);
>  	css_get(&mem->css);
> -	mm->mem_cgroup = mem;
>  }
>  
>  void mm_free_cgroup(struct mm_struct *mm)
>  {
> -	css_put(&mm->mem_cgroup->css);
> +	struct mem_cgroup *mem;
> +
> +	/*
> +	 * TODO: Should we assign mm->owner to NULL here?
> +	 */
> +	mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
> +	css_put(&mem->css);
>  }
>  
How about changing this css_get()/css_put() from accounting against mm_struct
to accouting against task_struct ?
It seems simpler way after this mm->owner change.


Thanks,
-Kame

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